package org.apache.dubbo.rpc.proxy;

import org.apache.dubbo.common.utils.ReflectUtils;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.ProxyFactory;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.service.Destroyable;
import org.apache.dubbo.rpc.service.EchoService;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import static org.apache.dubbo.common.constants.CommonConstants.COMMA_SPLIT_PATTERN;
import static org.apache.dubbo.rpc.Constants.INTERFACE;
import static org.apache.dubbo.rpc.Constants.INTERFACES;

/**
 * AbstractProxyFactory
 */
public abstract class AbstractProxyFactory implements ProxyFactory {

    private static final Class<?>[] INTERNAL_INTERFACES = new Class<?>[] {
            EchoService.class, Destroyable.class
    };

    @Override
    public <T> T getProxy(Invoker<T> invoker) throws RpcException {
        return getProxy(invoker,false);
    }

    @Override
    public <T> T getProxy(Invoker<T> invoker, boolean generic) throws RpcException {
        Set<Class<?>> interfaces = new HashSet<>();

        String config = invoker.getUrl().getParameter(INTERFACES);
        if (config != null && config.length() > 0) {
            String[] types = COMMA_SPLIT_PATTERN.split(config);

            for (String type : types) {
                interfaces.add(ReflectUtils.forName(type));
            }
        }

        if (generic) {
            try {
                // find the real interface from url
                String realInterface = invoker.getUrl().getParameter(INTERFACE);
                interfaces.add(ReflectUtils.forName(realInterface));
            } catch (Throwable ignored) {

            }
        }

        interfaces.add(invoker.getInterface());
        interfaces.addAll(Arrays.asList(INTERNAL_INTERFACES));

        return getProxy(invoker,interfaces.toArray(new Class<?>[0]));
    }

    public abstract <T> T getProxy(Invoker<T> invoker, Class<?>[] types);
}
